SPOILERS – the FABCAB puzzle

Location and background: when you enter the second chaos dungeon, there is an easy single, and a hard double puzzle awaiting you.  This is about one half of the latter double puzzle.

The room in question holds:

  • 8 levers
  • an array of display monsters, with each spot except the ones on the edge being able to alternate between two monster pictures
  • an automaton
  • a sign
  • a skull lever to the left

What you can achieve in this room:

  1. with the right lever combination, the skull on the left can trigger an exit. this is not the fabcab puzzle, this is the monster riddle, see spoiler hints HERE.  Once you leave via this exit though, you won’t get another chance at the fabcab puzzle and forego 3 chests with some of your former items.
  2. with the right of 3 different combinations of levers, 3 sections of wall can individually open in the east, and stay open even if the levers are changed later.  it is common that one is opened by lucky coincidence.  Each holds a chest with some former equipment.

******* HERE BE SPOILERS ******* only read one piece at a time and see if it helps *******

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The automaton says “COMPUTE FABCAB FOR 3 CHESTS”.  There are in fact 3 separate chests, and each of these portions represent a lever combination to ‘compute’:

  • FA
  • BC
  • AB

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******* NEXT SPOILER *******

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An automaton, like most computers, stores information in bytes.  A byte is 8 bits, and a bit is either a 0 or a 1.

A byte can be represented in binary form, like 01010101, or in decimal (a number from 0 to 255), or in hexadecimal, with the range of 00 to FF.

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******* FINAL SPOILER *******

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If FA, BC, and AB are seen as hexadecimal, then their binary equivalents are(1=skull open, left to right):

1111 1010

1011 1100

1010 1011

Those are the lever settings to (permanently) open each of the 3 wall sections and reveal a chest each.

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******* END SPOILER *******

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